Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 510,008	$ 615,386
Short-term investments	397,034	377,312
Accounts receivable, net	231	1,377
Prepaid expenses and other current assets	16,721	13,477
Total current assets	923,994	1,007,552
Property and equipment, net	14,709	17,083
Operating lease right-of-use assets	43,844	44,952
Other assets	4,386	4,692
Total assets	986,933	1,074,279
Current liabilities:
Accounts payable	6,572	9,855
Amounts due to joint development partners	4,353	5,753
Accrued expenses and other current liabilities	32,255	48,260
Short-term debt	1,659	1,645
Operating lease liabilities, current	5,972	6,007
Total current liabilities	50,811	71,520
Operating lease liabilities, noncurrent	40,658	42,169
Long-term debt	3,244	3,668
Other liabilities	824	2,441
Total liabilities	95,537	119,798
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, $0.0001 par value; 100,000,000 shares authorized as of December 31, 2022 and March 31, 2023; zero shares issued and outstanding as of December 31, 2022 and March 31, 2023, respectively	0	0
Common stock, $0.0001 par value; 4,876,000,000 Class A shares authorized as of December 31, 2022 and March 31, 2023; 201,707,557 and 202,384,736 Class A shares issued and outstanding as of December 31, 2022 and March 31, 2023, respectively; 24,000,000 Class B shares authorized, issued and outstanding as of December 31, 2022 and March 31, 2023, respectively	22	22
Additional paid-in-capital	2,584,528	2,567,723
Accumulated other comprehensive loss	(2,237)	(3,559)
Accumulated deficit	(1,690,917)	(1,609,705)
Total stockholders’ equity	891,396	954,481
Total liabilities and stockholders’ equity	$ 986,933	$ 1,074,279